Pension and Other Postretirement Benefit Plans - Summary of Weighted Average Assumptions Used in Determining Pension Plan and U.S. Pension and Other Postretirement Benefit Plan Information (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
United States
Net periodic benefit cost
Discount rate	4.20%	4.90%	4.10%
Expected rate of return on plan assets	8.50%	8.50%	8.50%
Salary growth rate	4.40%	4.50%	4.50%
Benefit obligation
Discount rate	4.80%	4.20%	5.10%
Salary growth rate	4.30%	4.40%	4.50%
International Pension Plans
Net periodic benefit cost
Discount rate	2.70%	3.80%	3.60%
Expected rate of return on plan assets	5.70%	6.00%	5.80%
Salary growth rate	2.90%	3.10%	3.30%
Benefit obligation
Discount rate	2.80%	2.70%	3.80%
Salary growth rate	2.90%	2.90%	3.10%